Chemistry: Principles and Reactions
8th Edition
ISBN: 9781305079373
Author: William L. Masterton, Cecile N. Hurley
Publisher: Cengage Learning
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Chapter 8, Problem 15QAP
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Graphic scheme of the transition of alpha-D-Glucopyranose and beta-D-Glucopyranose from Fischer projection to Haworth projection and to a chair conformation.
MeOH
OH
H2SO4 (cat.)
reflux
OMe
You are running this reaction, and your lab mate forgets to TLC their esterification reaction and
decides that after 2 hours of refluxing the reaction must be done. They concentrate the reaction
mixture and take a 1H NMR. In addition to the peaks for the desired product the spectrum
includes a peak at 11.90 ppm. The student then re-dissolves their product mixture in DCM and
washes the solution with a saturated aqueous NaHCO3 solution. They then dry the organic
layer, concentrate the sample on the rotary evaporator to remove the DCM and take a new 1H
NMR. The spectrum is now pure methyl ester with no additional peaks. What did the peak at
11.90 ppm indicate to your lab mate and why did washing with NaHCO3 cause it to disappear?
Determine the structure of the unknown compound depicted in these spectra. The molecular
formula is C8H12O.
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6.6 6.4 6.2
6.0 5.8
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2.9 2.8 2.7
1.6 1.5
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0-0.5
37 36 35 34 33 32 31 30 29 28
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Chapter 8 Solutions
Chemistry: Principles and Reactions
Chapter 8, Problem 1QAPChapter 8, Problem 2QAPChapter 8, Problem 3QAPChapter 8, Problem 4QAPChapter 8, Problem 5QAPChapter 8, Problem 6QAPChapter 8, Problem 7QAPChapter 8, Problem 8QAPChapter 8, Problem 9QAPChapter 8, Problem 10QAP
Chapter 8, Problem 11QAPChapter 8, Problem 12QAPChapter 8, Problem 13QAPChapter 8, Problem 14QAPChapter 8, Problem 15QAPChapter 8, Problem 16QAPChapter 8, Problem 17QAPChapter 8, Problem 18QAPChapter 8, Problem 19QAPChapter 8, Problem 20QAPChapter 8, Problem 21QAPChapter 8, Problem 22QAPChapter 8, Problem 23QAPChapter 8, Problem 24QAPChapter 8, Problem 25QAPChapter 8, Problem 26QAPChapter 8, Problem 27QAPChapter 8, Problem 28QAPChapter 8, Problem 29QAPChapter 8, Problem 30QAPChapter 8, Problem 31QAPChapter 8, Problem 32QAPChapter 8, Problem 33QAPChapter 8, Problem 34QAPChapter 8, Problem 35QAPChapter 8, Problem 36QAPChapter 8, Problem 37QAPChapter 8, Problem 38QAPChapter 8, Problem 39QAPChapter 8, Problem 40QAPChapter 8, Problem 41QAPChapter 8, Problem 42QAPChapter 8, Problem 43QAPChapter 8, Problem 44QAPChapter 8, Problem 45QAPChapter 8, Problem 46QAPChapter 8, Problem 47QAPChapter 8, Problem 48QAPChapter 8, Problem 49QAPChapter 8, Problem 50QAPChapter 8, Problem 51QAPChapter 8, Problem 52QAPChapter 8, Problem 53QAPChapter 8, Problem 54QAPChapter 8, Problem 55QAPChapter 8, Problem 56QAPChapter 8, Problem 57QAPChapter 8, Problem 58QAPChapter 8, Problem 59QAPChapter 8, Problem 60QAPChapter 8, Problem 61QAPChapter 8, Problem 62QAPChapter 8, Problem 63QAPChapter 8, Problem 64QAPChapter 8, Problem 65QAPChapter 8, Problem 66QAPChapter 8, Problem 67QAPChapter 8, Problem 68QAPChapter 8, Problem 69QAPChapter 8, Problem 70QAPChapter 8, Problem 71QAPChapter 8, Problem 72QAPChapter 8, Problem 73QAPChapter 8, Problem 74QAPChapter 8, Problem 75QAPChapter 8, Problem 76QAPChapter 8, Problem 77QAPChapter 8, Problem 78QAPChapter 8, Problem 79QAPChapter 8, Problem 80QAPChapter 8, Problem 81QAPChapter 8, Problem 82QAPChapter 8, Problem 83QAPChapter 8, Problem 84QAPChapter 8, Problem 85QAPChapter 8, Problem 86QAPChapter 8, Problem 87QAPChapter 8, Problem 88QAPChapter 8, Problem 89QAPChapter 8, Problem 90QAP
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- On table 4 there are two I can’t figure out how to answer. As well as q3&4arrow_forwardConductivity measurements of HCl solutions at 298 KC / mmol L-1 0.04 0.06 0.08 0.10 0.12χ / µS cm-1 17 25 34 42 51Calculate the limiting value of molar conductivity when the concentration is at infinite dilution without using Kohlrausch's empirical law.arrow_forwardThe cell Pt(s) | Cu(s), Cu²⁺(a) ⋮⋮ KCl(0.1 M) | Hg₂Cl₂(s), Hg(s) | Pt(s) has a potential of 0.710 V at 25 °C: a) Calculate the activity of the copper ion in solution. b) If the activity of the copper ion were multiplied by 4, keeping all other variables the same, what would the new cell potential be? Data: The potential of the calomel electrode with 0.1 M KCl and the standard potential of the copper electrode, compared to the standard hydrogen electrode, are 0.3335 V and -0.337 V, respectively. R = 8.314 J K⁻¹ mol⁻¹, F = 96485 C mol⁻¹.arrow_forward
- The steady-state hypothesis is sometimes used to study the deactivation of activated molecules. Is this correct?arrow_forwardAre both statements correct? A minimum number of photons must strike the molecules to activate them.The energy of photons depends on their frequency.arrow_forwardIf we have a concentration cell in an electrolyte with transport of Ag, AgCl, and KCl: a) Design the cell. b) Indicate the reactions that take place at the anode, at the cathode, and the overall reaction. c) Derive, justifying your answer, the equation that allows us to calculate the cell potential.arrow_forward
- If we have a concentration cell in an electrolyte with transport of Ag, AgCl, and KCl: a) Design the cell. b) Indicate the reactions that take place at the anode, at the cathode, and the overall reac tion. c) Derive, justifying your answer, the equation that allows us to calculate the cell potential.arrow_forwardConductivity measurements of HCl solutions at 298 KC / mmol L-1 0.04 0.06 0.08 0.10 0.12χ / µS cm-1 17 25 34 42 51a) Calculate the limiting value of molar conductivity when the concentration is at infinite dilution without using Kohlrausch's empirical law. b) Calculate the % error in the bibliography (426.0 S cm2 mol-1).arrow_forwardIf we have a concentration cell in an electrolyte with transport of Ag, AgCl, and KCl: a) Design the cell. b) Indicate the reactions that take place at the anode, at the cathode, and the overall reaction. c) Derive, justifying your answer, the equation that allows us to calculate the cell potential.arrow_forward
- Photons:a) All of them can activate all types of molecules. b) A minimum amount is needed to activate molecules. c) Their energy depends on their frequency. d) They do not participate in secondary processes.arrow_forwardDeactivation of activated moleculesa) Its rate does not usually depend on its concentrationb) If there are monomolecular processes then there are no bimolecular processesc) If there are bimolecular processes then there are no monomolecular processesd) The steady-state hypothesis is sometimes used for its study.arrow_forwardIndicate the correct statements about conductivity:a) It does not depend on the total volume of the sample being measured. b) It cannot be measured if the solvent is not water. c) It is used to measure the equilibrium constants of any type of reaction. d) It cannot be determined directly at infinite dilution.arrow_forward
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